The cornea, the first layer, is transparent.
The second layer is coloured and is called
the iris. The black spot in the centre of
the iris is the pupil. Tiny muscles control
the size of the pupil depending on the
amount of light the eyes are exposed to.
If there is less light, the pupil
automatically becomes bigger to take in
more light; and if the light is bright, the
pupil becomes smaller to take in less
light.
The third layer is the retina. It acts as a
‘screen’ on which the image of an object
is formed for us to see it.
Page |19 Go back to the contents page
PARTS OFANEYE
Eyeballs, which rest on a pad of fat have three main layers.
1
2
3